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+# $Id: CheckLib.pm,v 1.22 2008/03/12 19:52:50 drhyde Exp $
+
+package Devel::CheckLib;
+
+use strict;
+use vars qw($VERSION @ISA @EXPORT);
+$VERSION = '0.5';
+use Config;
+
+use File::Spec;
+use File::Temp;
+
+require Exporter;
+@ISA = qw(Exporter);
+@EXPORT = qw(assert_lib check_lib_or_exit);
+
+# localising prevents the warningness leaking out of this module
+local $^W = 1;    # use warnings is a 5.6-ism
+
+_findcc(); # bomb out early if there's no compiler
+
+=head1 NAME
+
+Devel::CheckLib - check that a library is available
+
+=head1 DESCRIPTION
+
+Devel::CheckLib is a perl module that checks whether a particular C
+library and its headers are available.
+
+=head1 SYNOPSIS
+
+    # in a Makefile.PL or Build.PL
+    use lib qw(inc);
+    use Devel::CheckLib;
+
+    check_lib_or_exit( lib => 'jpeg', header => 'jpeglib.h' );
+    check_lib_or_exit( lib => [ 'iconv', 'jpeg' ] );
+  
+    # or prompt for path to library and then do this:
+    check_lib_or_exit( lib => 'jpeg', libpath => $additional_path );
+
+=head1 HOW IT WORKS
+
+You pass named parameters to a function, describing to it how to build
+and link to the libraries.
+
+It works by trying to compile this:
+
+    int main(void) { return 0; }
+
+and linking it to the specified libraries.  If something pops out the end
+which looks executable, then we know that it worked.  That tiny program is
+built once for each library that you specify, and (without linking) once
+for each header file.
+
+=head1 FUNCTIONS
+
+All of these take the same named parameters and are exported by default.
+To avoid exporting them, C<use Devel::CheckLib ()>.
+
+=head2 assert_lib
+
+This takes several named parameters, all of which are optional, and dies
+with an error message if any of the libraries listed can
+not be found.  B<Note>: dying in a Makefile.PL or Build.PL may provoke
+a 'FAIL' report from CPAN Testers' automated smoke testers.  Use 
+C<check_lib_or_exit> instead.
+
+The named parameters are:
+
+=over
+
+=item lib
+
+Must be either a string with the name of a single 
+library or a reference to an array of strings of library names.  Depending
+on the compiler found, library names will be fed to the compiler either as
+C<-l> arguments or as C<.lib> file names.  (E.g. C<-ljpeg> or C<jpeg.lib>)
+
+=item libpath
+
+a string or an array of strings
+representing additional paths to search for libraries.
+
+=item LIBS
+
+a C<ExtUtils::MakeMaker>-style space-seperated list of
+libraries (each preceded by '-l') and directories (preceded by '-L').
+
+=back
+
+And libraries are no use without header files, so ...
+
+=over
+
+=item header
+
+Must be either a string with the name of a single 
+header file or a reference to an array of strings of header file names.
+
+=item incpath
+
+a string or an array of strings
+representing additional paths to search for headers.
+
+=item INC
+
+a C<ExtUtils::MakeMaker>-style space-seperated list of
+incpaths, each preceded by '-I'.
+
+=back
+
+=head2 check_lib_or_exit
+
+This behaves exactly the same as C<assert_lib()> except that instead of
+dying, it warns (with exactly the same error message) and exits.
+This is intended for use in Makefile.PL / Build.PL
+when you might want to prompt the user for various paths and
+things before checking that what they've told you is sane.
+
+If any library or header is missing, it exits with an exit value of 0 to avoid
+causing a CPAN Testers 'FAIL' report.  CPAN Testers should ignore this
+result -- which is what you want if an external library dependency is not
+available.
+
+=cut
+
+sub check_lib_or_exit {
+    eval 'assert_lib(@_)';
+    if($@) {
+        warn $@;
+        exit;
+    }
+}
+
+sub assert_lib {
+    my %args = @_;
+    my (@libs, @libpaths, @headers, @incpaths);
+
+    # FIXME: these four just SCREAM "refactor" at me
+    @libs = (ref($args{lib}) ? @{$args{lib}} : $args{lib}) 
+        if $args{lib};
+    @libpaths = (ref($args{libpath}) ? @{$args{libpath}} : $args{libpath}) 
+        if $args{libpath};
+    @headers = (ref($args{header}) ? @{$args{header}} : $args{header}) 
+        if $args{header};
+    @incpaths = (ref($args{incpath}) ? @{$args{incpath}} : $args{incpath}) 
+        if $args{incpath};
+
+    # work-a-like for Makefile.PL's LIBS and INC arguments
+    if(defined($args{LIBS})) {
+        foreach my $arg (split(/\s+/, $args{LIBS})) {
+            die("LIBS argument badly-formed: $arg\n") unless($arg =~ /^-l/i);
+            push @{$arg =~ /^-l/ ? \@libs : \@libpaths}, substr($arg, 2);
+        }
+    }
+    if(defined($args{INC})) {
+        foreach my $arg (split(/\s+/, $args{INC})) {
+            die("INC argument badly-formed: $arg\n") unless($arg =~ /^-I/);
+            push @incpaths, substr($arg, 2);
+        }
+    }
+
+    my @cc = _findcc();
+    my @missing;
+
+    # first figure out which headers we can't find ...
+    for my $header (@headers) {
+        my($ch, $cfile) = File::Temp::tempfile(
+            'assertlibXXXXXXXX', SUFFIX => '.c'
+        );
+        print $ch qq{#include <$header>\nint main(void) { return 0; }\n};
+        close($ch);
+        my $exefile = File::Temp::mktemp( 'assertlibXXXXXXXX' ) . $Config{_exe};
+        my @sys_cmd;
+        # FIXME: re-factor - almost identical code later when linking
+        if ( $Config{cc} eq 'cl' ) {                 # Microsoft compiler
+            require Win32;
+            @sys_cmd = (@cc, $cfile, "/Fe$exefile", (map { '/I'.Win32::GetShortPathName($_) } @incpaths));
+        } elsif($Config{cc} =~ /bcc32(\.exe)?/) {    # Borland
+            @sys_cmd = (@cc, (map { "-I$_" } @incpaths), "-o$exefile", $cfile);
+        } else {                                     # Unix-ish
+                                                     # gcc, Sun, AIX (gcc, cc)
+            @sys_cmd = (@cc, $cfile, (map { "-I$_" } @incpaths), "-o", "$exefile");
+        }
+        warn "# @sys_cmd\n" if $args{debug};
+        my $rv = $args{debug} ? system(@sys_cmd) : _quiet_system(@sys_cmd);
+        push @missing, $header if $rv != 0 || ! -x $exefile; 
+        _cleanup_exe($exefile);
+        unlink $cfile;
+    } 
+
+    # now do each library in turn with no headers
+    my($ch, $cfile) = File::Temp::tempfile(
+        'assertlibXXXXXXXX', SUFFIX => '.c'
+    );
+    print $ch "int main(void) { return 0; }\n";
+    close($ch);
+    for my $lib ( @libs ) {
+        my $exefile = File::Temp::mktemp( 'assertlibXXXXXXXX' ) . $Config{_exe};
+        my @sys_cmd;
+        if ( $Config{cc} eq 'cl' ) {                 # Microsoft compiler
+            require Win32;
+            my @libpath = map { 
+                q{/libpath:} . Win32::GetShortPathName($_)
+            } @libpaths; 
+            @sys_cmd = (@cc, $cfile, "${lib}.lib", "/Fe$exefile", 
+                        "/link", @libpath
+            );
+        } elsif($Config{cc} eq 'CC/DECC') {          # VMS
+        } elsif($Config{cc} =~ /bcc32(\.exe)?/) {    # Borland
+            my @libpath = map { "-L$_" } @libpaths;
+            @sys_cmd = (@cc, "-o$exefile", "-l$lib", @libpath, $cfile);
+        } else {                                     # Unix-ish
+                                                     # gcc, Sun, AIX (gcc, cc)
+            my @libpath = map { "-L$_" } @libpaths;
+            @sys_cmd = (@cc, $cfile,  "-o", "$exefile", "-l$lib", @libpath);
+        }
+        warn "# @sys_cmd\n" if $args{debug};
+        my $rv = $args{debug} ? system(@sys_cmd) : _quiet_system(@sys_cmd);
+        push @missing, $lib if $rv != 0 || ! -x $exefile; 
+        _cleanup_exe($exefile);
+    } 
+    unlink $cfile;
+
+    my $miss_string = join( q{, }, map { qq{'$_'} } @missing );
+    die("Can't link/include $miss_string\n") if @missing;
+}
+
+sub _cleanup_exe {
+    my ($exefile) = @_;
+    my $ofile = $exefile;
+    $ofile =~ s/$Config{_exe}$/$Config{_o}/;
+    unlink $exefile if -f $exefile;
+    unlink $ofile if -f $ofile;
+    unlink "$exefile\.manifest" if -f "$exefile\.manifest";
+    return
+}
+    
+sub _findcc {
+    my @paths = split(/$Config{path_sep}/, $ENV{PATH});
+    my @cc = split(/\s+/, $Config{cc});
+    return @cc if -x $cc[0];
+    foreach my $path (@paths) {
+        my $compiler = File::Spec->catfile($path, $cc[0]) . $Config{_exe};
+        return ($compiler, @cc[1 .. $#cc]) if -x $compiler;
+    }
+    die("Couldn't find your C compiler\n");
+}
+
+# code substantially borrowed from IPC::Run3
+sub _quiet_system {
+    my (@cmd) = @_;
+
+    # save handles
+    local *STDOUT_SAVE;
+    local *STDERR_SAVE;
+    open STDOUT_SAVE, ">&STDOUT" or die "CheckLib: $! saving STDOUT";
+    open STDERR_SAVE, ">&STDERR" or die "CheckLib: $! saving STDERR";
+    
+    # redirect to nowhere
+    local *DEV_NULL;
+    open DEV_NULL, ">" . File::Spec->devnull 
+        or die "CheckLib: $! opening handle to null device";
+    open STDOUT, ">&" . fileno DEV_NULL
+        or die "CheckLib: $! redirecting STDOUT to null handle";
+    open STDERR, ">&" . fileno DEV_NULL
+        or die "CheckLib: $! redirecting STDERR to null handle";
+
+    # run system command
+    my $rv = system(@cmd);
+
+    # restore handles
+    open STDOUT, ">&" . fileno STDOUT_SAVE
+        or die "CheckLib: $! restoring STDOUT handle";
+    open STDERR, ">&" . fileno STDERR_SAVE
+        or die "CheckLib: $! restoring STDERR handle";
+
+    return $rv;
+}
+
+=head1 PLATFORMS SUPPORTED
+
+You must have a C compiler installed.  We check for C<$Config{cc}>,
+both literally as it is in Config.pm and also in the $PATH.
+
+It has been tested with varying degrees on rigourousness on:
+
+=over
+
+=item gcc (on Linux, *BSD, Mac OS X, Solaris, Cygwin)
+
+=item Sun's compiler tools on Solaris
+
+=item IBM's tools on AIX
+
+=item Microsoft's tools on Windows
+
+=item MinGW on Windows (with Strawberry Perl)
+
+=item Borland's tools on Windows
+
+=back
+
+=head1 WARNINGS, BUGS and FEEDBACK
+
+This is a very early release intended primarily for feedback from
+people who have discussed it.  The interface may change and it has
+not been adequately tested.
+
+Feedback is most welcome, including constructive criticism.
+Bug reports should be made using L<http://rt.cpan.org/> or by email.
+
+When submitting a bug report, please include the output from running:
+
+    perl -V
+    perl -MDevel::CheckLib -e0
+
+=head1 SEE ALSO
+
+L<Devel::CheckOS>
+
+L<Probe::Perl>
+
+=head1 AUTHORS
+
+David Cantrell E<lt>david@cantrell.org.ukE<gt>
+
+David Golden E<lt>dagolden@cpan.orgE<gt>
+
+Thanks to the cpan-testers-discuss mailing list for prompting us to write it
+in the first place;
+
+to Chris Williams for help with Borland support.
+
+=head1 COPYRIGHT and LICENCE
+
+Copyright 2007 David Cantrell. Portions copyright 2007 David Golden.
+
+This module is free-as-in-speech software, and may be used, distributed,
+and modified under the same conditions as perl itself.
+
+=head1 CONSPIRACY
+
+This module is also free-as-in-mason software.
+
+=cut
+
+1;